N-alkylpiperidyl alkynylamines



Patent.

2,867,620 N-ALKYLPIPERIDYL ALKYNYLAMINES John H. Biel, Milwaukee, Wis., assignor to Lakeside Laboratories, Inc., a corporation of Wisconsin No Drawing. Application August 30, 1956 Serial No. 606,977

Claims. '(Cl. 260-247-5) and acid addition and quaternary ammonium salts thereof, wherein m is an integer from 1 through 6, n is an integer from 1 through 5', R and R are the same or different groups of the class consisting of lower alkyl groups, aryl groups, particularly monocyclic aryl groups such as the phenyl group, aralkyl groups, particularly monocyclic 'aryl-lower alkyl groups, and groups in which R; and R are joined to a ring, preferably a monocyclic ring with 5 or 6 atoms in the ring such as pyrrolidino, morpholino and piperidino. These compounds may be conveniently prepared by contacting a reactive metal salt of an aminoalkyne with an N-alkyl halopiperidine or an N-alkyl-piperidylalkyl halide. This reaction may be represented as follows:

wherein m, n, R, R and K; have the significance previously assigned, X is a reactive halogen, and A is a ;reactive metal.

Typical aminoalkynes which may be used in the form I R is a lower alkyl group and form 9.... Representative N-alkyl halopiperidines and N-alkyl-pi be used in the ..process of reactive metal derivatives, such as the alkali metal salts, are 3-dimethylamino-l-propyne, 3-pyrrolidino-lpropyne. 3-morpholino'1-propyne, 3-diethylarhino-1-propyne, 4-dimethylamino-l-butyne, S-dibenzylamino-l-pentyne and 6-piperidino-l-hexyne.

The reaction is preferably effected by contacting the reactants in the presence of an inert solvent such as xylene,

ethyl ether, or hexane. Elevated temperatures such as the reflux temperature are suitable for effecting the reaction. The reaction. is terminated when essentially completed, which may take from about 1 to 20 hours, and the product recovered by conventional means from the reaction mixture.

Among the products which niay be produced in thisway from appropriate reactants are p-(3-diethylamino-1- Patented Jan. 6, 1959 2 propynyl) N methyl piperidine, f3 (4 morpholino-2- butynyl) N methyl piperidine, [3 (3 dimethylamino- 1-propynyl)-N-methyl piperidine and y-(6-pyrrolidince 3-hexynyl) -N-propyl piperidine.

Acid addition salts of the compounds provided by this invention are formed by contacting one mole of the base with one to two moles of an inorganic acid such as bydrochloric acid or sulfuric acid, or an organic acid such as maleic acid, fumaric acid, formic acid and citric acid.

Quaternary ammonium salts are produced by reacting the bases with alkyl, aralkyl, substituted aralkyl or alkynyl esters of inorganic and organic acids. The reaction preferably is effected in the presence of a suitable inert organic solvent. Methyl bromide, propargyl bromide, o-chlorobenzyl iodide, methyl chloride, benzyl chloride and methyl sulfate are representative compounds that may be used to form quarternary ammonium salts.

The non-toxic acid addition salts of the N-alkyl-pi peridylalkynylamines are useful as diuretic agents in the treatment of congestive heart failure. The non-toxic quaternary-ammonium salts are potent and long-acting hypotensive agents useful in the therapy of high blood pressure and peripheral vascular disease.

The following examples are presented to show methods of producing certain of the novel compounds included within this invention. It is understood, however, that these examples are included only for purposes of illustration, and that the invention isnot to be restricted to the embodiments specifically disclosed therein.

EXAMPLE 1 B-(3-diethylamin0-1-pr0pynyl)-N-methyl piperidine To 12 gm. (0.3 mole) of sodamide in 50 cc. of xylene was added 33 gm. (0.3 mole) of diethylaminopropyne. The mixture was heated at reflux for 1 hour and then 70 gm. (0.5 mole) of N-methyl-3-chloropiperidine was added. The mixture was refluxed for 20 hours. One hundred cc. of water was added to dissolve solids and the layers separated. The xylene layer was extracted three times with 150 cc. portions of dilute hydrochloric acid. The acid aqueous solution was washed three times with 50 cc. portions of ethyl ether, saturated with potassium hydroxide, and extracted three times with 150 cc. of ethyl ether. It was dried over potassium carbonate and the product recovered by ,vacuum distillation, B. P. 86-88 C./0.05 mm.; yield 80 gm., 77%.

Analysis.Calcd. C13H24N2: 13.46% N. Found: 13.23% N.

EXAMPLE 2 v j3-(4-hto'r phblinb-2 butynyl)-N-methyl piperidine To 12 gm. (0.03 mole) of sodamide in cc. of toluene r was added'38- gm. (0.3 mole) of morpholino propyne.

It was refluxed for 1 hour and 89 gm. of N-methyl-3- bromoethyl. piperidine added. After refluxing for 20 hours the product was recovered as in Example 1, B. P. 107-110 C./0.07 mm.; yield 17 gm., 34%

Analysis-.Calcd. C H N O: 11.86% 11.81% N.

N. Found:

EXAMPLE 3 a fi-(3-dimethylamino-l-pr0pynyl)-N-methyl piperidine .firti-ri tlidivalarsenal)l-N- a hyl piperidine Sodium pyrrolidino propyne was reacted with N- methyl-3-chloropiperidine as in Example 1, B. P. 107- 109 C./0.05 mm.

Analysis.Calcd.: 13.59% N. Found: 13.54% N.

E M LE 13-(4-diethylamin0-I-butynyl)N-methyl piperidine Sodium diethylamino propyne and N- meth'y1-3-bromomethyl piperidine' were reacted'as in Example 1 to form this'base; B. P. 88-90 C./0.3 mm.

Analysis.Calcd.: 12.61% Found: 12.24% N. EXAMPLE 7 3- (4-pyrr0lidino-1-butynyl) -N-methyl piperidine Sodium pyrrolidino propyne and N-methyl-il-bromomethyl piperidine when reacted as in Example 1 gave this compound; B. P. 95-,98" C../,0.5 mm.

Analysis.-Calcd.: 12.72% N. Found: 12.32% N.

XAMP E .8

,8-(3-dimethylamino-1 -pji'opynyl -N-me t hyl piperidine bis-hydrochloride To 9 gm. (0.05 mole) of the base from Example 3 in 50 cc. of acetone was added ethyl ether and'hydrochloric acid to pH 23. It was refrigerated overnight, filtered and dried, M. P. 193-194" C.

Analysis.-Calcd. C H N Cl 11.06% N, 28.06% Cl. Found: 10.98% N, 26.92% Cl.

EXAMPLE 9 fl-(3-dimethylamino-1-pr0pynyl)-N-methyl piperidine bis-methobromide To 18 gm. (0.1 mole) of the 'base from Example 3 in 50 cc. isopropanol was added 19 gm. (0.2 mole) of methylbromide. The mixture was allowed to stand at room temperature overnight; filtered and the product dried, M. P. 212-213 'C. I i

Sodium morpholino s an 4. 13'-(3-dimethylamino-l-propynyl)-N-methyl idine.

' 5'. ;3( 3-pyrrolidino-l-propynyl)-N-methyl piperidine.

6. 18-(3-morpholino-l-propynyl)-N-methyl piperidine. 7. 13-(4-diethylamino-l-butynyl)-N-methyl piperidine. 8. 13-(4-pyrrolidino-l-butynyl)-N-methyl piperidine. 9. A member of the group consisting of compounds of the formulae piperand and non-toxic acid addition and non-toxic quaternary ammonium salts thereof, wherein m is an integer from 1 through 6, n is an integer from 1 through '5, R is a lower alkyl group and R and R are members of the group consisting ot flower alkyl' groups,'--andgroups :in which represents a member of the group consisting of the morpholino, pyrrolidino and 'piperidino groups, said quaternary salts containing a member of the group consisting 'of lower 'alkyl, lower alkynyl and phenyl-lower alkyl groups.

' 10..The'process which comprises reacting a member of the group'c'ons'is'ting of compounds of the formulae Analysis.-Calcd. C H N Br 7.5 6% N, 43.24% Br. (CH2)n|-1X Found: 7.45% N, 42.95% Br; The following salts were also prepared:

oH;)..-cEc oH=)-..Am.rt+r N N (EH3 R X and Assay M.P.,I Yield, Calcd. Found Am m n R X degre per- 7 cent I 'Per- Per- Per- Percent cent cent cfent N x N x (C,H5)zN--.-. 0 1 our Br 214- 10 44 7. 04 40. 20 0.03 40171 Pvrrolidiuo--. 0 1 0H;- Br 229- 30 e0 7. 07' 40.40 0.50 "40.96 Morpholino-.. o 1 CHS'" Br 212 13 6.79 38.83 0.07 3.8.74 (C H5)zN. o 1 HCEGCH, Br 80- 92 6.28 35.87 '6. 15 35.48 (02H5)N.--- 1 1 CH0- Br 155 59 09 6.79 38.83 6.43 30.44 Pyrrolidino--. 1, 1 CH3 Br -102 05 6.82 39.02 0.55 --36.,41 Morpholino--. 1 1 CH3- Bl. 232- 33 63 0.57 30.630220 36.23

Foam.

What is claimed is: I. Di-lower alkyl-amino-lower alkynyl-N-lower alkyl piperidine.

2. B-(3-diethylamino-l-propynyD-N-methyl piperidine. 3. fi-(4-morpholino-2-butynyl)-N-methyl piperidine.

w 6 a) withacornpound of the formula wherein, in each occurrence, m is an integer from 1 B! through 6, n is an integer from 1 through 5, R is a (CH N lower alkyl group and R and R are members of the group consisting of lower alkyl groups, and groups in R: 5 which to produce the corresponding member of the group con- 3, sisting of compounds of the formulae N/R \R: 1 represents a member of the group consisting of the R: morpholino, pyrrolidino and piperidino groups.

References Cited in the file of this patent UNITED STATES PATENTS 15 2,684,965 Weston et a1 July 27, 1954 and UNITED STATES PATENT OFFICE Certificate of Correction Patent No. 2,867,620 January 6, 1959 John H. Biel It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction and that the said Letters Patent should read as corrected below.

Column 2, line 55, Example 2, for bromoethyl read -bromomethyl; column 3, approximately line 13, Example 6, in the heading thereto, for butynyDN-methg Z read -butynyl) -N-methyZ-; column 4, lines 20 to 27, claim 9, the second formula should appear as shown below instead of as in the patent:

Signed and sealed this 11th day of August 1959.

[SEAL] Attest:

KARL H. AXLINE, ROBERT C. WATSON,

Attestz'ng Ofioer, Commissioner of Patents, 

3. B-(4-MORPHOLINO-2-BUTYNYL)-N-METHYL PIPERIDINE.
 9. A MEMBER OF THE GROUP CONSISTING OF COMPOUNDS OF THE FORMULAE 